MMC

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MMC

(1) See Microsoft Management Console.

(2) (MultiMediaCard) A flash memory card for cellphones, PDAs and other handheld devices. Introduced in 1997 by the MultiMediaCard Association with 4MB of storage, capacity increased to 2GB in the mid-2000s. MMCs were superseded by SD Cards, but SD Card readers support both formats.

MMC Versions
Numerous versions of MMC were introduced, including the encrypted SecureMMC with licensing data in a tamper-proof section of the card. A one-time programmable (OTP) version was available, and a read-only (ROM-MMC) card was used in Palm PDAs. Three smaller MMCs also debuted (see chart below).

Embedded MMC (eMMC) and miCARD
eMMC is flash memory and an MMC controller in a BGA package for direct mounting on a circuit board. miCARD is a high-capacity MMC (up to 2TB) that plugs into a USB port and with an adapter into an MMC slot. In 2008, eMMC and miCARD were turned over to the JEDEC division of EIA.


MultiMediaCards Vs. SD Cards
MMCs look like SD Cards; however, the thicker SD Cards (2.1mm vs. 1.4) have two more pins. MMCs can be read in SD Card readers, and dual-format SD/MMC readers (bottom) accept both. See SD Card.


MultiMediaCards Vs. SD Cards
MMCs look like SD Cards; however, the thicker SD Cards (2.1mm vs. 1.4) have two more pins. MMCs can be read in SD Card readers, and dual-format SD/MMC readers (bottom) accept both. See SD Card.


MultiMediaCards Vs. SD Cards
MMCs look like SD Cards; however, the thicker SD Cards (2.1mm vs. 1.4) have two more pins. MMCs can be read in SD Card readers, and dual-format SD/MMC readers (bottom) accept both. See SD Card.







MMC Vs. Reduced-Size MMC (RS-MMC)
RS-MMC, Dual-Voltage RS-MMCs (DV RS-MMCs) and MMCmobile cards can be used in full-size MMC slots with an adapter (see below). See SD Card.





                      Data   Size             TransferMMC TYPE  (mm)     Voltage  (Mhz)

  MMC        32x24x1.4  Hi        20
  MMC+       32x24x1.4  Hi        26/52

  RS-MMC     18x24x1.4  Hi        20
  DV RS-MMC  18x24x1.4  Lo/Hi     20
  MMCmobile  18x24x1.4  Lo/Hi     20

  MMCmicro   14x12x1.1  Lo/Hi
  miCARD     21x12x1.95 Lo/Hi/5v
  eMMC       BGA chip   Lo/Hi

  Lo=1.7 to 1.95v    Hi=2.7 to 3.6v
References in periodicals archive ?
SCM's software drivers help create a host environment for SecureMMC memory cards with the aid of the native SD slot or an external SCM reader.
MMC and SecureMMC storage cards can be used in any device that supports Secure Digital (SD) storage cards as long as the software on the device supports them.
MMCA members can license the SecureMMC Client Software Suite from BSQUARE free of charge.
According to Yves Leonard, Chairman of the MMCA Board of Directors, "The new SecureMMC interface specification is the result of close cooperation among MMCA members, some of whom are demonstrating compatible card prototypes working with commercially available handsets.
Over 25 members of the open standards MMCA will exhibit at 3GSM World Congress this week in Barcelona, Spain, demonstrating a wide range of products and applications based on MMC and SecureMMC standards.
According to Yves Leonard, MMCA Board Chairman, "End-users who want ease of use and portability of digital content to multiple playback devices will benefit from the extension of the OMA DRM ecosystem to the SecureMMC v2.
The MultiMediaCard Association (MMCA) will demonstrate SecureMMC in Digital Rights Management (DRM) and VPN (Virtual Private Network) access applications, at CTIA Wireless 2005 in New Orleans, LA this week.
The MultiMediaCard Association (MMCA) is demonstrating an application of SecureMMC in Digital Rights Management (DRM) at 3GSM World Congress 2005.
The first proposed applications to be implemented on SecureMMC Ver.
For PDAs, portable PCs and mobile phones that have MultiMediaCard slots, the Renesas PIN SecureMMC solution now offers an enhancement to the RSA SecurID software token.
In addition, the SecureMMC authentication process takes place within the secured environment of the memory card TRM, so the secret PIN code is never exposed to the unsecured environment of the handheld device.
The advanced secure memory card demonstrated at the conference adds a user authentication feature to the first generation Hitachi SecureMMC for the Keitaide-Music distribution network on mobile phones in service in Japan since 2000.